<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title></title>
</head>
<body>
    <input type="text" placeholder="hello">
    <hr>
    <input type="text" placeholder="你好啊">
    <hr>
    <input type="text" placeholder="哈哈哈">

    <script>
       function fixPlaceholder(){
           var input =document.createElement('input');
           if('placehloder'in put){
               return;
           };
           diFix();
       }
        function doFix (){
            var ipts = document.getElementsByTagName('input');
                i = 0



        };

       fixPlaceholder();

    </script>
</body>
</html>